Field dependence of J/sub c/ for filamentary RE-Ba-Cu-O superconductors prepared by a solution spinning method

The filamentary RE-Ba-Cu-O (RE=Nd, Nd-Eu-Gd, and Nd-Sm-Eu-Gd) precursor was prepared by a solution spinning method, through a homogeneous aqueous solution containing mixed acetates of RE, Ba and Cu, poly(vinyl alcohol) and organic acids. The filamentary precursor was partially melted in flowing 0.1%O/sub 2/+Ar or 1%O/sub 2/+Ar and then oxygenated under various conditions. The transport critical current density (J/sub c/) of the samples was measured in magnetic fields up to 10 T at 77 K. The influence of field dependence of J/sub c/ on the initial different RE elements in the filamentary RE-Ba-Cu-O superconductors was examined. The field dependence of J/sub c/ was improved by mixing three or four different RE elements. The J/sub c/ value at 77 K and up to 6 T for the sample partially melted in flowing 0.1%O/sub 2/+Ar was higher than that for the sample melted in flowing 1%O/sub 2/+Ar. The highest J/sub c/ value of more than 1.76/spl times/10/sup 4/ A/cm/sup 2/ at 77 K and 9 T was detected for filamentary Nd-Sm-Eu-Gd-Ba-Cu-O superconductors partially melted in flowing 0.1%O/sub 2/+Ar.